Graphical Analysis of the CCRL Portland Cement Proficiency Sample Database (Samples 1-72).
Graphical Analysis of the CCRL Portland Cement
Proficiency Sample Database (Samples 1-72).
Spring, C. B.; Pielert, J. H.; Leigh, S.; Heckert, N. A.
NISTIR 5387; 123 p. March 1994.
Available from: National Technical Information Service
Order number: PB94-196557
cements; construction; standards; test methods;
A large database of Portland cement and Portland cement
concrete interlaboratory test results has been generated
at the Cement and Concrete Reference Laboratory (CCRL)
since 1965. The database represents a rich resource
inasmuch as the cements tested were produced by many
different production facilities, from raw materials
obtained from different geological areas, and over a
long period of time. Participation varies from 120 to
over 200 laboratories located throughout the United
States and in several other countries. Computer and
statistical techniques are used to present the data from
the first 72 Portland cement samples in graphical forms
to better understand cement and cement testing. Data
for each of 10 physical test properties and 11 chemical
"compounds" of Portland cement are represented
graphically through the use of box plots. For each
property and compound, the box plots of data from
multiple samples are plotted sequentially as distributed
by CCRL and also sorted on median values. In several
instances, box plots for one test property are ordered
by the median values of another property to analyze
possible relationships. Also, the characteristics of
each of 72 cements are profiled (graphically) in
relation to the population of results of other cements.
These box plots and profiles provide insight for
modeling cement performance which is the long-term goal
of this study.